Not sure what the ... was for, Bio explained it pretty well.
But, I'll take a crack at it too.
HID lights do not focus the beam in the same pattern that halogen bulbs do. That is why they are illegal in a non projector housing headlight.
In order to get the most out of your HIDs, you either need to get a set of projectors (good, but not great) or do a projectors retrofit into the stock housing.
If you dont do either of those, then just keep aiming them until they are the best you can get, but if you find yourself getting flashed a bunch, you need to aim them lower.
